Metal structural beam



FIG. 1 is a top plan view of a metal structural beam showing my new design, the beam being broken away to show indeterminate length;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is the opposite side elevational view thereof;

FIG. 5 is an end elevational view thereof;

FIG. 6 is the opposite end elevational view thereof;

FIG. 7 is a top perspective view thereof; and,

FIG. 8 is a bottom perspective view thereof. 

The ornamental design for a metal structural beam, as shown and described. 